WO2014141985A1 - 眼鏡レンズ及びその製造方法並びにレンズ供給システム - Google Patents
眼鏡レンズ及びその製造方法並びにレンズ供給システム Download PDFInfo
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- WO2014141985A1 WO2014141985A1 PCT/JP2014/055726 JP2014055726W WO2014141985A1 WO 2014141985 A1 WO2014141985 A1 WO 2014141985A1 JP 2014055726 W JP2014055726 W JP 2014055726W WO 2014141985 A1 WO2014141985 A1 WO 2014141985A1
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- Prior art keywords
- lens
- initial
- shape data
- spectacle
- spectacle lens
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/022—Ophthalmic lenses having special refractive features achieved by special materials or material structures
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
- G02C7/027—Methods of designing ophthalmic lenses considering wearer's parameters
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/4097—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by using design data to control NC machines, e.g. CAD/CAM
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45157—Grind optical lens
Definitions
- the present invention relates to a spectacle lens suitable for reducing the uncomfortable feeling experienced by the wearer due to the prism action, a manufacturing method thereof, and a lens supply system for supplying such a spectacle lens.
- Wraparound glasses are widely used in sports fields.
- the wrap-around glasses have a wide width and curve along the face so as to cover the face.
- the wearer can enjoy the effects such as the expansion of the field of view, the windbreak, and the incident light control from the lateral direction by wearing such glasses with a large warp angle of the frame.
- the wearer wears wrap-around glasses with power or wrap-around glasses without power, depending on whether or not the vision is corrected.
- Patent Document 1 For example, as pointed out in U.S. Patent Application Publication No. 2012/8089 (hereinafter referred to as “Patent Document 1”), in this type of wrap-around glasses, a lens is attached to a frame with a small warp angle. The prism action, astigmatism, average power error, etc. felt by the wearer's eyes are different from general glasses worn everyday. For this reason, a wearer wearing wrap-around glasses may feel uncomfortable. In Patent Document 1, attention is paid to the fact that the conventional design method does not consider reducing the left and right imbalance of the prism action, and this imbalance is considered to be a cause of discomfort to the wearer.
- Patent Document 1 in order to reduce the left and right imbalance of the prism action, for example, a plurality of light beams including the front view direction that pass through the center of rotation of the eye assumed in optical design have a lens front angle.
- a method for correcting the shape data of the rear surface (concave surface) of the lens so that the prism action received by the initial lens in the state matches or approaches the prism action received by the initial lens without the lens front angle.
- the lens front angle is a horizontal angle formed by a line of sight passing through the center of rotation of the eye when viewed in the distance without a lens and a normal of the front surface (convex surface) of the lens at the fitting point.
- Patent Document 1 reduces the discomfort of the wearer when wearing spectacles with a large warp angle of the frame, such as wrap-around spectacles, by reducing the left-right imbalance of the prism action by the above method.
- a suitable technique has been proposed.
- the present inventor has found that the cause of discomfort experienced by the wearer when wearing wraparound glasses is only due to the warp angle of the frame (in other words, the lens front angle). I found that there are others.
- the present invention has been made in view of the above circumstances, and the purpose of the present invention is to eliminate the newly found cause, thereby making the wearer feel uncomfortable when wearing wrap-around glasses or the like. It is an object of the present invention to provide a spectacle lens suitable for mitigation, a manufacturing method thereof, and a lens supply system for supplying such spectacle lens.
- a lens supply system includes an initial shape data acquisition unit that acquires initial shape data of an eyeglass lens, and a base curve of an initial lens that is manufactured based on the initial shape data is defined as a first base curve.
- a predetermined lens having a second base curve lower than the first base curve is defined as an index spectacle lens
- the initial lens receives rays in each line-of-sight direction passing through the center of the eye assumed in optical design.
- Shape data correcting means for correcting the initial shape data so as to make the prism action coincide with or approach the prism action received by the index spectacle lens
- spectacle lens manufacturing means for manufacturing the spectacle lens based on the corrected initial shape data Is provided.
- the eyeglass lens supplied by the lens supply system according to an aspect of the present invention has each line of sight passing through the center of the eye assumed in the optical design, even when the base curve is deep, such as wrap-around eyeglasses.
- the prism action received by the light beam in the direction is matched to the index spectacle lens having a small base curve. Even when the spectacle lens is viewed from the periphery, the wearer does not feel uncomfortable because the direction of the line of sight through the lens is not so different from usual.
- the lens supply system is a shape for measuring the shape of a daily spectacle lens when a spectacle lens worn by a wearer who intends to wear the spectacle lens is defined as a daily spectacle lens. It is good also as a structure provided with a measurement means and a daily spectacle shape data creation means which produces the shape data of a daily spectacle lens based on the result of a measurement.
- the shape data correction means is configured so that the prism action received by the initial lens by the light rays in the respective line-of-sight directions passing through the center of the eye assumed in the optical design matches or approaches the prism action received by the daily spectacle lens.
- the initial shape data is corrected based on the shape data of the spectacle lens.
- the lens supply system may include an input unit that inputs the value of the base curve of the daily spectacle lens measured by the shape measuring unit.
- the lens supply system may include a sample selection unit that selects one sample lens from a plurality of predetermined types of sample lenses.
- the shape data correction means matches the prism action received by the sample lens selected by the sample selection means with the prism action received by the initial lens in the direction of the eye passing through the center of the eye assumed in the optical design.
- the initial shape data is corrected based on the shape data of the sample lens so as to make it close or close.
- the lens supply system includes an initial shape data acquisition unit that acquires initial shape data of a spectacle lens, and light rays in each line-of-sight direction passing through the center of the eye assumed in optical design are transmitted by the initial lens.
- Shape data correction means for correcting the initial shape data so as to make the received prism action coincide with or approach the state of the naked eye without the prism action.
- the shape data correction means calculates a deviation amount between the prism action received by the initial lens by the light beam in each line-of-sight direction passing through the center of the eye assumed in the optical design and the prism action received by the index spectacle lens, At least one of the convex surface and the concave surface of the initial lens may be corrected so that the calculated amount of deviation falls within a predetermined allowable range.
- the shape data correction means calculates the amount of deviation between the prism action received by the initial lens by the light beam in each line of sight passing through the center of the eye assumed in the optical design and the state in which the light beam does not receive the prism action. At least one of the convex surface and the concave surface of the initial lens may be corrected so that the amount of misalignment falls within a predetermined allowable range.
- the shape data correction means may correct at least one of the convex surface and the concave surface of the initial lens so that the amount of deviation in the peripheral region of the lens is within a predetermined allowable range.
- the center of the eye is, for example, the center of eyeball rotation or the entrance pupil center of the eye when viewed from the front.
- the spectacle lens according to an aspect of the present invention defines a base curve of an initial lens manufactured based on predetermined initial shape data as a first base curve, and a second base lower than the first base curve.
- a specified lens with a curve is defined as an index spectacle lens
- the spectacle lens according to one aspect of the present invention is used by a wearer who intends to wear the spectacle lens on a daily basis for the prism action that the initial lens receives rays in the respective line-of-sight directions that pass through the center of the eye assumed in optical design. It may have a shape formed based on correction data obtained by correcting the initial shape data so as to match or approach the prism action received by the everyday spectacle lens.
- the spectacle lens according to one aspect of the present invention has a prism function in which a ray in each line-of-sight direction passing through the center of the eye assumed in optical design is received by an initial lens manufactured based on predetermined initial shape data. It has a shape formed based on correction data obtained by correcting the initial shape data so as to match or approach the state of the naked eye without action.
- the eyeglass lens manufacturing method includes an initial shape data acquisition step of acquiring eyeglass lens initial shape data, and a base curve of an initial lens manufactured based on the initial shape data as a first curve.
- a predetermined lens having a second base curve that is lower than the first base curve is defined as an index spectacle lens
- the rays in each line of sight passing through the center of the eye assumed in the optical design are defined as a base curve.
- a shape data correction step for correcting the initial shape data so that the prism action received by the initial lens matches or approaches the prism action received by the index spectacle lens, and glasses for manufacturing the spectacle lens based on the corrected initial shape data Includes lens manufacturing process.
- a spectacle lens suitable for reducing the discomfort of the wearer when wearing spectacles having a large base curve such as wrap-around spectacles, a method for manufacturing the spectacle lens, and such spectacle lenses are provided.
- a lens supply system is provided.
- FIG. 5A shows a virtual optical model assuming the wearing state of the daily spectacle lens
- FIG. 5B shows a virtual optical model assuming the wearing state of the design lens of the embodiment of the present invention.
- FIG. 6A shows a virtual optical model in which the initial lens model of Example 1 of the present invention is arranged
- FIG. 6B shows a virtual optical model in which the target lens model of Example 1 of the present invention is arranged.
- FIGS. 7A, 7B, and 7C show the prism distribution of the initial lens model, the prism distribution of the target lens model, and the prism distribution of the designed lens model, respectively, in Example 1 of the present invention.
- FIG. 7D shows the concave (inner surface) shape of the designed lens model of Example 1 of the present invention.
- 8A shows the prism power in each line-of-sight direction of Example 1 of the present invention
- FIGS. 8B and 8C show the prism power and prism shown in FIG. 8A, respectively.
- FIG. 9A shows a virtual optical model in which the initial lens model of Example 2 of the present invention is arranged
- FIG. 9B shows a virtual optical model in which the target lens model of Example 2 of the present invention is arranged.
- FIGS. 10 (a), 10 (b), and 10 (c) respectively show the prism distribution of the initial lens model, the prism distribution of the target lens model, and the prism distribution of the designed lens model in Example 2 of the present invention.
- FIG. 10 (d) shows the concave (inner surface) shape of the design lens model of Example 2 of the present invention.
- FIG. 11A shows the prism power in each line-of-sight direction of Example 2 of the present invention
- FIGS. 11B and 11C show the prism power and prism shown in FIG. 11A, respectively.
- FIG. 11 (d) shows aberrations in each line-of-sight direction according to Example 2 of the present invention.
- FIG. 12A shows a virtual optical model in which the initial lens model according to the third embodiment of the present invention is arranged
- FIG. 12B shows a virtual optical model in a naked eye state.
- FIGS. 13A, 13B, and 13C are respectively the prism distribution of the initial lens model, the target prism distribution (no prism action due to the naked eye), and the designed lens model of Example 3 of the present invention.
- FIG. 13A, 13B, and 13C are respectively the prism distribution of the initial lens model, the target prism distribution (no prism action due to the naked eye), and the designed lens model of Example 3 of the present invention.
- FIG. 13 (d) shows the concave (inner surface) shape of the designed lens model of Example 3 of the present invention.
- FIG. 14A shows the prism power in each line-of-sight direction of Example 3 of the present invention
- FIGS. 14B and 14C show the prism power and prism shown in FIG. 14A, respectively.
- FIG. 14 (d) shows aberrations in the respective line-of-sight directions of Example 3 of the present invention. It is a figure which shows the example of weighting of prism correction.
- FIG. 1 is a block diagram illustrating a configuration of a spectacle lens manufacturing system 1 according to the present embodiment.
- a spectacle lens manufacturing system 1 includes a spectacle store 10 that orders spectacle lenses according to prescriptions for customers (wearers), and spectacle lenses that manufacture spectacle lenses in response to an order from the spectacle store 10. It has a lens manufacturing factory 20.
- the order to the spectacle lens manufacturing factory 20 is made through a predetermined network such as the Internet or data transmission by FAX.
- the orderer may include ophthalmologists and general consumers.
- the spectacle store 10 is provided with a store computer 100.
- the store computer 100 is, for example, a general PC (Personal Computer), and is installed with software for ordering eyeglass lenses from the eyeglass lens manufacturing factory 20.
- Lens data and frame data are input to the store computer 100 through operation of a mouse, a keyboard, and the like by an eyeglass store staff.
- the lens data includes, for example, prescription values (spherical refractive power, astigmatic refractive power, astigmatic axis direction, prism refractive power, prism base direction, addition power, pupil distance (PD), lens material, refractive index, Optical design type, lens outer diameter, lens thickness, edge thickness, eccentricity, base curve, spectacle lens wearing conditions (corneal apex distance, forward tilt angle, frame warp angle), spectacle lens type (single focal sphere, single focus) This includes focal aspherical surfaces, multifocals (double focus, progressive), coating (dyeing, hard coating, antireflection film, UV cut, etc.), layout data according to customer requirements, and the like.
- the frame data includes the shape data of the frame selected by the customer.
- the frame data is managed by, for example, a barcode tag, and can be obtained by reading the barcode tag attached to the frame by a barcode reader.
- the store computer 100 transmits order data (lens data and frame data) to the eyeglass lens manufacturing factory 20 via the Internet, for example.
- FIG. 20 Glasses lens manufacturing factory 20
- a LAN Local Area Network
- the spectacle lens design computer 202 and the spectacle lens processing computer 204 are general PCs, and a spectacle lens design program and a spectacle lens processing program are installed, respectively.
- Order data transmitted from the store computer 100 via the Internet is input to the host computer 200.
- the host computer 200 transmits the input order data to the spectacle lens design computer 202.
- FIG. 2 is a flowchart showing the manufacturing process of the spectacle lens in the spectacle lens manufacturing factory 20.
- the eyeglass lens design computer 202 is installed with a program for designing eyeglass lenses according to orders, creates lens design data based on order data (lens data), and based on order data (frame data). Create the target lens processing data.
- the design of the spectacle lens by the spectacle lens design computer 202 will be described in detail later.
- the spectacle lens design computer 202 transfers the created lens design data and target lens processing data to the spectacle lens processing computer 204.
- the eyeglass lens processing computer 204 reads the lens design data and the target lens shape processing data transferred from the eyeglass lens design computer 202 and drives and controls the processing machine 206.
- the processing machine 206 produces molds corresponding to the outer surface (convex surface) and inner surface (concave surface) of the lens by grinding and polishing materials such as metal, glass, and ceramics according to the lens design data. To do.
- the produced pair of molds are arranged to face each other with an interval corresponding to the thickness of the spectacle lens, and the outer peripheral surfaces of both molds are wound with an adhesive tape to seal between the molds.
- a hole is made in a part of the adhesive tape, and the lens raw material liquid is injected into the cavity (sealing space between the molds) through the hole.
- the lens raw material liquid injected and filled in the cavity is polymerized and cured by heat, ultraviolet irradiation, or the like.
- the polymer (glasses lens base material) by which each transfer surface shape of a pair of shaping
- the spectacle lens substrate obtained by polymerization and curing is removed from the mold.
- the released spectacle lens base material is subjected to various coatings such as removal of residual stress by annealing treatment, dyeing processing, hard coating processing, antireflection film, ultraviolet ray cutting and the like. Thereby, the spectacle lens is completed and delivered to the spectacle store 10.
- the spectacle lens manufacturing factory 20 divides the frequency of the entire production range into a plurality of groups, and has a convex curve shape (for example, spherical shape, aspherical shape, etc.) suitable for the frequency range of each group.
- a semi-finished lens blank group having a lens diameter may be prepared in advance for ordering spectacle lenses.
- the semi-finished lens blank is, for example, a resin blank or a glass blank, and a convex surface and a concave surface are an optical surface (completed surface) and a non-optical surface (unfinished surface), respectively.
- an optimal semi-finished lens blank is selected based on the lens data, and the selected semi-finished lens blank is set in the processing machine 206.
- the processing machine 206 manufactures an uncut lens by grinding and polishing the concave surface of the set semi-finished lens blank according to the lens design data.
- the uncut lens after the concave surface is manufactured is subjected to various coatings such as dyeing, hard coating, antireflection film, and UV protection.
- the peripheral surface of the uncut lens after various coatings is processed based on the lens shape processing data created by the eyeglass lens design computer 202.
- the spectacle lens processed into the target lens shape is delivered to the spectacle store 10.
- the present inventor found the base curve as one of the causes that cause the wearer to feel uncomfortable, and the base curve is independent of the curvature angle of the frame (in other words, the lens front angle) regardless of the presence or absence of the power. And gained the knowledge that it was causing discomfort.
- FIG. 3 is a flowchart showing a spectacle lens design process performed by the spectacle lens design computer 202.
- a spectacle lens having a deep base curve such as a wrap-around spectacle
- the eyeglass lenses designed by this design process include not only lenses that have been prescribed refractive power to correct the eyesight of the wearer, but also lenses that are not intended for eyesight correction (such as sports glasses and sunglasses that are not included in the power) ) Is also included.
- spectacle lenses that are framed in a frame with a large warp angle such as wrap-around spectacles, but also spectacle lenses that are framed in a flat frame with a small warp angle.
- the design of a wrap-around spectacle lens in which the refractive power is prescribed is exemplified.
- An initial lens is designed based on the lens data.
- the initial lens is designed without a lens front angle.
- FIG. 4A shows a predetermined virtual optical model that is constructed at the time of designing the initial lens and that includes an eyeball that assumes a lens wearing state (assumed in terms of optical design) and an initial lens.
- a virtual optical model corresponding to the left eye will be described as an example, and the right eye will be omitted in order to avoid redundant description.
- FIG. 4 (a) in the respective drawings showing the virtual optical model, shown at an angle overlooking the eyeball model E L corresponding to the left eye from the overhead. Further, since the virtual optical model corresponds to the left eye, a subscript L is attached to each code. As shown in FIG.
- an eyeball model EL is arranged in the virtual model space.
- Eyeball model E L is prescription values of the wearer included in the order data (spherical power, cylindrical power) suitable model is selected and arranged based on.
- a lens model (initial lens) L L is arranged at a position spaced a predetermined intercorneal vertex distance from the eyeball model E L.
- the reference numeral P L refers to fitting point is located in the lens convex surface.
- the symbol O EL indicates the center of eyeball rotation.
- Reference sign BL L indicates a reference front line of sight connecting the fitting point P L and the eyeball rotation center O EL .
- the reference front line of sight BL L coincides with the line of sight passing through the center of eyeball rotation when viewed far away without a lens.
- Reference sign HL L indicates a horizontal line orthogonal to the reference front view line BL L at the fitting point P L.
- Lens Model (initial lens) L L is disposed so as the normal N of the lens convex surface in the fitting point P L in a horizontal cross section through the fitting point P L coincides with the reference forward sight line BL L. In a horizontal section passing through the fitting point P L , a state where the normal line N and the reference front view line BL L coincide with each other is a state where there is no lens front angle (see FIG. 4A).
- the state where the line of sight BL L does not coincide is a state where there is a lens front angle (see FIG. 4B described later).
- Symbols A L , B L , and C L indicate the line of sight of the left eye when the lens model (initial lens) L L is worn.
- Reference signs A Le , B Le , and C Le indicate the image side line of sight of the lines of sight A L , B L , and C L , respectively.
- the image side line of sight indicates a line of sight from the eyeball rotation center O EL to the lens model L L.
- Reference signs A Lo , B Lo , and C Lo refer to the object side line of sight among the lines of sight A L , B L , and C L , respectively.
- the object-side line of sight indicates a line-of-sight portion outside the lens model L L.
- the image side line of sight A Le is tilted leftward with respect to the image side line of sight B Le by an angle ⁇
- the image side line of sight C Le is relative to the image side line of sight B Le . It is inclined to the right by an angle ⁇ .
- the image side line of sight B Le at the time of front view coincides with the reference front line of sight BL L.
- ⁇ S11-Processing 2 in FIG. 3 The prism action which a light ray passing through the eyeball rotation center O EL and including a front view direction receives by the lens model (initial lens) L L is calculated.
- the calculation result shows the distribution of the value of the prism action at each point of the lens model (initial lens) L L.
- this distribution is referred to as “initial distribution”.
- based on the eyeball rotation center O EL defines the line of sight and light, in another embodiment, to define the line of sight and light relative to the entrance pupil center of the eye when viewed from the front Also good.
- a lens front angle is set for the lens model (initial lens) L L based on the frame data.
- a prism effect experienced by eyeball rotation center O ray of the front view direction through the EL is later lens front angle setting lens model (initial lens) L L, light rays lens front angle setting of the front view direction through the eyeball rotating center O EL
- the lens model (initial lens) L L is corrected so as to match (or approach) the prism action received by the previous lens model (initial lens) L L.
- the direction of the lens concave surface with respect to the lens convex surface is corrected.
- this correction is referred to as “direction correction”
- the lens model L L after the direction correction is referred to as “lens model (after the direction correction) L L ”.
- ⁇ S11-Process 7 in FIG. 3> It is determined whether the amount of deviation of the prism action of the corrected distribution with respect to the initial distribution is within an allowable range. If the amount of deviation is not within the allowable range, the process proceeds to ⁇ Processing 8-1>. If the amount of deviation falls within the allowable range, the process proceeds to ⁇ Processing 8-2>.
- ⁇ S11-Processing 8-1 in FIG. 3> The concave shape of the lens model (after orientation correction) L L is corrected so as to reduce the amount of deviation. After correcting the concave shape of the lens model (after orientation correction) L L , the process returns to ⁇ Process 6>.
- ⁇ S11-Processing 8-2 in FIG. 3> The concave shape of the lens model L L so that the refractive power of the light acting on the eye on the line of sight passing through the eyeball rotation center O EL and the predetermined refractive power measurement position matches the prescription value in a state where the lens front angle is set. Correct.
- a lens model L L (hereinafter, “lens model (left-right difference reduction) L L ”) in which the left-right difference in prism action due to the lens front angle is reduced is completed.
- FIG. 4B shows a virtual optical model in which an eyeball model E L and a lens model (left-right difference reduction) L L are arranged.
- symbols A L ′, B L ′, and C L ′ respectively indicate the line of sight of the left eye when the lens model (left-right difference reduction) L L is worn.
- Reference signs A Le ′, B Le ′, and C Le ′ indicate the image side line of sight among the lines of sight A L ′, B L ′, and C L ′, respectively.
- Reference signs A Lo ′, B Lo ′, and C Lo ′ indicate object side line-of-sight lines of line-of-sight lines A L ′, B L ′, and C L ′, respectively.
- a symbol ⁇ LF is a horizontal angle formed by the normal line N and the reference front view line BL L and indicates a lens front angle.
- the lens model (left-right difference reduction) L L has the fitting point P L positioned on the reference front line of sight BL L , and the normal line N and the reference front line of sight BL L are the lenses. It arrange
- the image side line of sight B Le ′ in front view coincides with the reference front line of sight BL L in the same manner as the image side line of sight B Le (see FIG. 4A).
- the image side line of sight A Le ′ is inclined leftward by the angle ⁇ with respect to the image side line of sight B Le ′, and the image side line of sight C Le ′ Similarly to the image side line of sight C Le (see FIG. 4A), the image side line of sight B Le ′ is inclined rightward by an angle ⁇ .
- the object side line of sight B Lo ′ is different in position from the object side line of sight B Lo (see FIG. 4A), but the direction is the same.
- the angle formed between the image side line of sight A Le and the object side line of sight A Lo in FIG. 4A is defined as ⁇ a , and is formed between the image side line of sight A Le ′ and the object side line of sight A Lo ′ in FIG.
- ⁇ a ′ the angle formed between the image side line of sight C Le and the object side line of sight C Lo of FIG. 4A is defined as ⁇ c
- ⁇ c an angle formed between the image side line of sight C Le and the object side line of sight C Lo of FIG. 4A
- ⁇ c an angle formed between the image side line of sight C Le and the object side line of sight C Lo of FIG. 4A
- the shape data of the lens concave surface is corrected by executing this processing step S11. Specifically, the prism action that the light rays in each line-of-sight direction receive by the lens model (left-right difference reduction) L L having the lens front angle ⁇ LF is received by the lens model (initial lens) L L having a zero lens front angle.
- the shape data of the lens concave surface is corrected so as to match (or approach) the prism action.
- the left-right difference in prism action due to the lens front angle is reduced.
- the difference in prism action is still large in the peripheral region of the lens from the daily state (for example, the state of wearing daily glasses with a shallow base curve or the state of naked eyes). Therefore, it is considered that the wearer feels uncomfortable when viewing from the periphery because the direction of the line of sight through the lens is significantly different from usual.
- the spectacle lens design computer 202 calculates the distribution of the prism action values of the lens model (left-right difference reduction) L L completed in the processing step S11 of FIG. 3 (reduces the left-right difference of the prism action due to the lens front angle). To do.
- this distribution is referred to as “distribution after reducing the left / right difference”.
- the spectacle lens design computer 202 sets the distribution of the target prism action values in order to make the prism action felt by the eye of the wearer wearing the wrap-around eyeglasses as usual.
- this distribution is referred to as “target distribution”.
- the following three examples are given as methods for setting the target distribution.
- ⁇ Target distribution setting method 1> The spectacle store staff measures the shape (base curve or the like) of the spectacle lens worn by the wearer everyday using a measuring instrument (not shown) installed in the spectacle store 10.
- the spectacle lens worn daily by the wearer is referred to as “daily spectacle lens”.
- Data such as a base curve collected by measurement is input to the storefront computer 100.
- daily spectacle lenses have a shallower base curve than wrap-around spectacles (having a so-called flat base curve).
- the store computer 100 calculates the distribution of the prism action value of the wearer's daily spectacle lens based on the measurement data, and transmits the calculated distribution to the spectacle lens manufacturing factory 20 via the Internet.
- the spectacle lens design computer 202 receives the distribution of the prism action value of the daily spectacle lens calculated by the store computer 100 via the host computer 200, and sets the received distribution as a target distribution.
- the value of the base curve of the everyday spectacle lens can be obtained without necessarily using a measuring instrument.
- the value of the base curve of an everyday spectacle lens may be known.
- the spectacle store staff can obtain the value of the base curve of the daily spectacle lens from the description of the catalog of the product. . Further, the spectacle store staff may use the experience to visually determine and acquire the value of the base curve of the daily spectacle lens.
- ⁇ Target distribution setting method 2> This setting method 2 is useful when the wearer's daily spectacle lens shape cannot be measured.
- a plurality of types of target distributions are stored in advance in the memory of the spectacle lens design computer 202.
- Each of the plurality of types of target distributions is a distribution of prism action values in a state where different sample lenses are worn.
- the sample lens is a lens that assumes a daily spectacle lens and has a so-called flat base curve.
- the plurality of types of sample lenses assumed here correspond to all wearers, and therefore have different base curves and lens diameters, for example.
- the eyeglass lens design computer 202 selects and sets a sample lens (target distribution) optimum for the wearer from a plurality of types of sample lenses (target distribution) based on the lens data.
- the above setting methods 1 and 2 are methods targeted at a wearer who wears spectacle lenses on a daily basis.
- the setting method 3 is a method useful for a person who is usually naked eyes.
- the eyeglass lens design computer 202 sets the state of the naked eye (that is, the distribution in which the prism action in front of the eyes is zero over the entire area) as the target distribution.
- the spectacle lens design computer 202 calculates the amount of deviation between the distribution after reducing the left / right difference calculated in the processing step S12 of FIG. 3 and the target distribution set in the processing step S13 (setting of target distribution) of FIG. calculate.
- the spectacle lens design computer 202 determines whether or not the amount of deviation calculated in step S14 (calculation of the amount of deviation) in FIG. 3 is within a predetermined allowable range. For example, it is determined whether or not the amount of deviation at each predetermined evaluation point is within a predetermined allowable range. If there is even one evaluation point that does not fall within the predetermined allowable range (S15: NO in FIG. 3), the process proceeds to processing step S16 (correction of lens concave surface shape) in FIG. When all the evaluation points are within the predetermined allowable range (S15 in FIG. 3: YES), the process proceeds to the processing step S17 (frequency correction) in FIG.
- the spectacle lens design computer 202 may determine whether or not the total deviation amount at each predetermined evaluation point is within a predetermined allowable range.
- the evaluation points may be arranged over the entire lens, or arranged only in a specific region (for example, a region around the lens through which the line of sight passes when the wearer sees the periphery). It may be.
- the value of the predetermined allowable range may be different for each evaluation point of each area (for example, the front view area and the peripheral area) divided in advance.
- the spectacle lens design computer 202 corrects the concave shape of the lens model (left-right difference reduction) L L in order to keep the shift amount within a predetermined allowable range. Specifically, the prism effect of rays of sight line direction through the eyeball rotating center O EL is received by the lens model (right difference mitigation) L L, with no prismatic effect (or prismatic effect experienced by daily spectacle lens or sample lens naked eye The concave shape is corrected so as to match (or approach) the state of (2). After correcting the concave surface shape, the spectacle lens design computer 202 returns to the processing step S14 (calculation of the shift amount) in FIG.
- the lens model L L whose concave shape has been corrected in this processing step S16 will be referred to as “lens model (after concave shape correction) L L ”.
- the deviation amount is converged to a value within a predetermined allowable range by repeating the processing step S14 (calculation of the deviation amount) in FIG. 3 to the processing step S16 (correction of the lens concave surface shape) in FIG.
- the eyeglass lens design computer 202 uses a lens model (after correcting the concave surface shape) so that the refractive power of the light acting on the eye coincides with the prescription value on the line of sight passing through the eyeball rotation center OEL and a predetermined refractive power measurement position.
- LL Correct the concave shape of L.
- FIG. 5 (a) is a diagram with the same reference numerals as FIG. 4 (a), and wearing an everyday spectacle lens (the base curve is shallow and the lens front angle (in other words, the warp angle of the frame) is substantially absent).
- a virtual optical model including an eyeball model E L and a daily spectacle lens model L L assuming a state is shown.
- FIG. 5B is a diagram to which the same reference numerals as those in FIG. 4B are attached, and a virtual optical model in which the eyeball model E L and the spectacle lens model L L designed by the design process of FIG. 3 are arranged. Show.
- the angle theta a formed by the image-side line of sight A Le and the object-side line of sight A Lo see Fig.
- example design lenses three examples (Examples 1 to 3) of spectacle lenses (hereinafter referred to as “example design lenses”) obtained by performing the design process shown in FIG. 3 will be described.
- the lens model (initial lens) L L of Example 1 is a lens with a degree, a deep base curve, and a lens front angle (a frame warp angle) of zero.
- sunglasses with a degree with a deep base curve are assumed.
- the target in the first embodiment is a lens in which the same power as the lens model (initial lens) L L is prescribed, and the base curve is shallower than the lens model (initial lens) L L and the lens front angle is zero. It is a spectacle lens.
- the “with degree” lens is for the purpose of correcting visual acuity, and refers to a lens for which spherical refractive power, astigmatic refractive power or the like is prescribed.
- FIG. 6A is a diagram with the same reference numerals as those in FIG. 4A, and shows a virtual optical model in which the lens model (initial lens) L L and the eyeball model E L of the first embodiment are arranged.
- . 6 (b) is a diagram is attached the same symbols as FIG. 4 (b), the virtual optical model of the present embodiment the target lens at 1 (daily spectacle lens) Model L L and the eyeball model E L is located Indicates.
- the design data of the lens model (initial lens) L L L and the target lens (daily spectacle lens) model L L are as follows.
- FIG. 7A shows the prism distribution of the lens model (initial lens) L L of the first embodiment. Since the lens model (initial lens) L L of Example 1 has a lens front angle of zero, the distribution after reducing the left-right difference in Example 1 is the same as the prism distribution of FIG. 7A.
- Figure 7 (b) shows a first embodiment of a target lens (daily spectacle lenses) prism distribution model L L (target distribution).
- FIG. 7C shows the prism distribution of the example design lens model of Example 1 having the same deep base curve as the lens model (initial lens) L L. 7A to 7C, the left diagram shows the horizontal component of the prism distribution, and the right diagram shows the vertical component of the prism distribution (unit: prism diopter).
- FIG. 7D is a diagram showing the concave (inner surface) shape of the example design lens model of Example 1, wherein the left diagram shows the astigmatism distribution of the concave surface, and the right diagram shows the average of the concave surfaces. Indicates frequency distribution (unit: diopter).
- FIG. 8A is a diagram illustrating the prism power (unit: prism diopter) in each line-of-sight direction (viewing angle ⁇ of the image-side line-of-sight in the vertical direction, unit: °) according to the first embodiment.
- FIG. 8B is a graph showing each prism power shown in FIG.
- FIG. 8 (b) in the solid line indicates the prism power in the embodiment design lens model
- the dotted line indicates the prism power of the lens model (initial lens) L L
- dashed line indicates the target lens (daily spectacle lens) Model L
- the prism power of L is shown.
- FIG. 8C is a graph showing the prism power difference shown in FIG.
- the solid line indicates the prism power difference between the example design lens model and the target lens (daily spectacle lens) model LL
- the dotted line indicates the lens model (initial lens) LL and the target lens (daily). shows the prism power difference between the spectacle lenses) model L L.
- FIG. 8C is a graph showing the prism power difference shown in FIG.
- the solid line indicates the prism power difference between the example design lens model and the target lens (daily spectacle lens) model LL
- the dotted line indicates the lens model (initial lens) LL and the target lens (daily). shows the prism power difference between the spectacle
- FIG. 8D is a diagram illustrating aberration (unit: diopter) in each line-of-sight direction (viewing angle ⁇ of the vertical image-side line-of-sight, unit: °) according to the first embodiment.
- the astigmatism (AS) of the example design lens model, the power error (PE) of the example design lens model, and the astigmatism (AS) of the lens model (initial lens) L L ) indicates a power error (PE) (unit: diopter).
- the lens model (initial lens) L L has a prism distribution. Is different from the target lens (daily spectacle lens) model L L particularly in the lens peripheral region.
- the example design lens model has the same deep base curve as the lens model (initial lens) L L
- the prism distribution is substantially equal to the target lens (daily spectacle lens) model L L throughout the lens.
- the design process shown in FIG. 3 is performed, so that in the design lens model of the embodiment having a deep base curve, the eyes are worn when the daily spectacle lens having a shallow base curve is worn. It is possible to obtain substantially the same prism action as that felt.
- the lens model (initial lens) L L of Example 2 is a lens having no degree, a deep base curve, and a lens front angle (frame warp angle) of zero. As an example of such a lens, it is assumed that there is no degree sunglasses with a deep base curve.
- the target in the second embodiment is a lens for which the power is not prescribed, and is a daily spectacle lens having a shallower base curve and a zero lens front angle than the lens model (initial lens) L L.
- FIG. 9 shows a virtual optical model diagram of the second embodiment.
- FIG. 9A is a diagram similar to FIG. 6A and shows a virtual optical model in which a lens model (initial lens) L L is arranged.
- FIG. 9B is a view similar to FIG. 6B and shows a virtual optical model in which a target lens (daily spectacle lens) model L L is arranged.
- the design data of the lens model (initial lens) L L shown in FIG. 9A and the target lens (daily spectacle lens) model L L shown in FIG. 9B are as follows.
- FIGS. 10 (a) to 10 (c) are similar to FIGS. 7 (a) to 7 (c), respectively, and the prism distribution and target of the lens model (initial lens) L L of the second embodiment.
- the prism distribution of the lens (daily spectacle lens) model L L and the prism distribution of the example design lens model are shown.
- FIG. 10D is a diagram similar to FIG. 7D, and shows the concave (inner surface) shape of the example design lens model of Example 2.
- FIG. 11A is a diagram similar to FIG. 8A and shows the prism power in each line-of-sight direction of Example 2.
- FIG. 11B is a diagram similar to FIG. 8B, and is a graph of each prism power shown in FIG. 11A.
- FIG. 11C is a view similar to FIG. 8C, and is a graph showing the prism power difference shown in FIG. 11A.
- FIG. 11D is a diagram similar to FIG. 8D, and shows aberrations in the respective line-of-sight directions of Example 2.
- Example 2 as shown in FIGS. 10A to 10C and FIGS. 11B and 11C, the lens model (initial lens) L L has a prism distribution. Is different from the target lens (daily spectacle lens) model L L in the entire lens area.
- the example design lens model has the same deep base curve as the lens model (initial lens) L L
- the prism distribution approximates the target lens (daily spectacle lens) model L L over the entire area.
- the design process shown in FIG. 3 is performed, so that in the design lens model of the embodiment with a deep base curve, when the eyeglass lens with a shallow base curve is worn, An approximation of the prism action to feel is obtained.
- the lens model (initial lens) L L of the third embodiment is the same as that of the second embodiment. Specifically, there is no degree, the base curve is deep, and the lens front angle (the warp angle of the frame) is large. Zero lens.
- the target in the third embodiment is the naked eye. That is, in the third embodiment, the prism action that the eye feels when wearing the example design lens is approximated to a naked eye state (that is, the prism action in front of the eye has a zero distribution over the entire area).
- FIG. 12 shows a virtual optical model diagram of the third embodiment.
- FIG. 12A is a diagram similar to FIG. 6A and shows a virtual optical model in which a lens model (initial lens) L L is arranged.
- FIG. 12B shows a naked-eye virtual optical model in which only the eyeball model EL is arranged. Omitted FIG 12 (a) lens model shown in (initial lens) L L of the lens model (initial lens) the second embodiment the design data of the L L and is for the same.
- FIGS. 13 (a) to 13 (c) are similar to FIGS. 10 (a) to 10 (c), respectively, and the prism distribution and target of the lens model (initial lens) L L of the third embodiment.
- the prism distribution of the (naked eye state) and the prism distribution of the example design lens model are shown.
- FIG. 13D is a diagram similar to FIG. 10D, and shows the concave (inner surface) shape of the Example design lens model of Example 3.
- FIG. 14A is the same diagram as FIG. 11A, and shows the prism power in each line-of-sight direction of Example 3.
- FIG. 14B is a diagram similar to FIG. 11B, and is a graph of each prism power shown in FIG. 14A.
- FIG. 14C is a view similar to FIG. 11C, and is a graph showing the prism power difference shown in FIG. 14A.
- FIG. 14D is a diagram similar to FIG. 11D, and shows aberrations in each line-of-sight direction of Example 3.
- FIG. 14B is a diagram similar to FIG. 11B, and is a graph of each prism power shown in FIG. 14A.
- FIG. 14C is a view similar to FIG. 11C, and is a graph showing the prism power difference shown in FIG. 14A.
- FIG. 14D is a diagram similar to FIG. 11D, and shows aberrations in each line-of-sight direction of Example 3.
- Example 3 as shown in FIGS. 13A to 13C and FIGS. 14B and 14C, the lens model (initial lens) L L has a prism distribution. Is different from the target (naked eye state) in the entire lens area.
- the example design lens model has the same deep base curve as the lens model (initial lens) L L , the prism distribution approximates the target (naked eye state) over the entire area.
- the prism action is in the naked eye state (that is, the prism action is not present). ) Is approximated.
- the embodiment of the present application also includes contents appropriately combined with examples and modifications explicitly shown in the specification or obvious examples and modifications.
- the lens concave surface shape is corrected, but in another embodiment, the lens convex surface shape may be corrected, or the convex surface, You may correct
- the power near the center may change in the spectacle lens for the purpose of visual acuity correction.
- a power that is not originally required is added near the center.
- FIG. 15 shows a weighting example of such prism correction.
- the vertical axis in FIG. 15 indicates the weight value for prism correction, and the horizontal axis indicates the distance (unit: mm) from the lens center.
- the necessary lens power is maintained near the center of the lens, while the prism action is normal in the periphery. The one that matches or approximates the state is obtained.
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Abstract
Description
図1は、本実施形態の眼鏡レンズ製造システム1の構成を示すブロック図である。図1に示されるように、眼鏡レンズ製造システム1は、顧客(装用者)に対する処方に応じた眼鏡レンズを発注する眼鏡店10と、眼鏡店10からの発注を受けて眼鏡レンズを製造する眼鏡レンズ製造工場20を有している。眼鏡レンズ製造工場20への発注は、インターネット等の所定のネットワークやFAX等によるデータ送信を通じて行われる。発注者には眼科医や一般消費者を含めてもよい。
眼鏡店10には、店頭コンピュータ100が設置されている。店頭コンピュータ100は、例えば一般的なPC(Personal Computer)であり、眼鏡レンズ製造工場20への眼鏡レンズの発注を行うためのソフトウェアがインストールされている。店頭コンピュータ100には、眼鏡店スタッフによるマウスやキーボード等の操作を通じてレンズデータ及びフレームデータが入力される。レンズデータには、例えば処方値(球面屈折力、乱視屈折力、乱視軸方向、プリズム屈折力、プリズム基底方向、加入度数、瞳孔間距離(PD:Pupillary Distance)等)、レンズ材質、屈折率、光学設計の種類、レンズ外径、レンズ厚、コバ厚、偏心、ベースカーブ、眼鏡レンズの装用条件(角膜頂点間距離、前傾角、フレームのそり角)、眼鏡レンズの種類(単焦点球面、単焦点非球面、多焦点(二重焦点、累進)、コーティング(染色加工、ハードコート、反射防止膜、紫外線カット等))、顧客の要望に応じたレイアウトデータ等が含まれる。フレームデータには、顧客が選択したフレームの形状データが含まれる。フレームデータは、例えばバーコードタグで管理されており、バーコードリーダによるフレームに貼り付けられたバーコードタグの読み取りを通じて入手することができる。店頭コンピュータ100は、発注データ(レンズデータ及びフレームデータ)を例えばインターネット経由で眼鏡レンズ製造工場20に送信する。
眼鏡レンズ製造工場20には、ホストコンピュータ200を中心としたLAN(Local Area Network)が構築されており、眼鏡レンズ設計用コンピュータ202や眼鏡レンズ加工用コンピュータ204をはじめ多数の端末装置が接続されている。眼鏡レンズ設計用コンピュータ202、眼鏡レンズ加工用コンピュータ204は一般的なPCであり、それぞれ、眼鏡レンズ設計用のプログラム、眼鏡レンズ加工用のプログラムがインストールされている。ホストコンピュータ200には、店頭コンピュータ100からインターネット経由で送信された発注データが入力される。ホストコンピュータ200は、入力された発注データを眼鏡レンズ設計用コンピュータ202に送信する。
[図2のS1(眼鏡レンズの設計)]
図2は、眼鏡レンズ製造工場20内での眼鏡レンズの製造工程を示すフローチャートである。眼鏡レンズ設計用コンピュータ202は、受注に応じた眼鏡レンズを設計するためのプログラムがインストールされており、発注データ(レンズデータ)に基づいてレンズ設計データを作成し、発注データ(フレームデータ)に基づいて玉型加工データを作成する。眼鏡レンズ設計用コンピュータ202による眼鏡レンズの設計は、後に詳細に説明する。眼鏡レンズ設計用コンピュータ202は、作成されたレンズ設計データ及び玉型加工データを眼鏡レンズ加工用コンピュータ204に転送する。
眼鏡レンズ加工用コンピュータ204は、眼鏡レンズ設計用コンピュータ202から転送されたレンズ設計データ及び玉型加工データを読み込み、加工機206を駆動制御する。
上述したように、本発明者は、鋭意検討を重ねた結果、ラップアラウンド型眼鏡を装用したときに装用者が受ける違和感の原因がフレームのそり角(換言すると、レンズフロント角)に起因するものだけでなく、他にも存在することを見出した。具体的には、ラップアラウンド型眼鏡は、装用者の顔を側方あたりまで覆う都合上、一般的な眼鏡に比べてレンズのベースカーブが深い。そのため、度数の有無に拘わらず、レンズ周辺部において日常の状態(例えばベースカーブの浅い日常の眼鏡を装用している状態や裸眼の状態)とのプリズム作用の差が大きい。そのため、装用者は、ラップアラウンド型眼鏡の装用時に周辺視すると、レンズを通じた視線の方向が普段と大きく異なるため、違和感を覚えるものと考えられる。また、例えば、ゴルフのパッティングなど、目視による正確な測定を必要とするスポーツでは、レンズを通じた視線の方向が普段と異なることが致命的なミスを招く虞がある。また、一部のサングラス等には、例えばファッション性を出すため、日常装用する一般的な眼鏡に比べてレンズのベースカーブが深いものがある(フレームのそり角については大きいものから小さいものまである。)。装用者は、このような眼鏡の装用時に周辺視した際も、レンズを通じた視線の方向が普段と大きく異なるため、違和感を覚えるものと考えられる。このように、本発明者は、装用者に違和感を与える原因の1つとしてベースカーブを見出し、ベースカーブが度数の有無に拘わらずかつフレームのそり角(換言すると、レンズフロント角)とは独立して違和感を生じさせているという知見を得た。
特許文献1に記載されているように、ラップアラウンド型眼鏡には、レンズフロント角によるプリズム作用に左右差がある。眼鏡レンズ設計用コンピュータ202は、プリズム作用の左右差を軽減するため、以下の処理を実行する。なお、各処理の詳細は、特許文献1にて参照することができる。また、フレームのそり角(換言すると、レンズフロント角)によるプリズム作用の左右差が実質的に問題にならない程度の眼鏡を設計する場合は、本処理ステップ11のうち〈処理3〉から〈処理8-2〉を省略することができる。
レンズデータに基づいて初期レンズを設計する。初期レンズは、レンズフロント角がない状態で設計される。
図4(a)は、初期レンズの設計時に構築される、レンズ装用状態を想定した(光学設計上想定される)眼球及び初期レンズからなる所定の仮想光学モデルを示す。なお、本実施形態では、左眼に対応する仮想光学モデルを例示的に説明し、右眼については重複説明を避けるため、省略する。図4(a)に例示されるように、仮想光学モデルを示す各図では、左眼に対応する眼球モデルELを頭上から眺める角度で示す。また、仮想光学モデルは左眼に対応するため、各符号には下付き文字Lが付される。
図4(a)に示されるように、仮想モデル空間には眼球モデルELが配置される。眼球モデルELは、発注データに含まれる装用者の処方値(球面屈折力、乱視屈折力)に基づいて適切なモデルが選択され配置される。眼球モデルELに対して所定の角膜頂点間距離を空けた位置にはレンズモデル(初期レンズ)LLが配置される。なお、図4(a)中、符号PLは、レンズ凸面に位置するフィッティングポイントを指す。符号OELは、眼球回旋中心を指す。符号BLLは、フィッティングポイントPLと眼球回旋中心OELとを結ぶ基準正面視線を指す。基準正面視線BLLは、レンズが無い状態で遠方視したときの眼球回旋中心を通る視線と一致する。符号HLLは、フィッティングポイントPLにおいて基準正面視線BLLと直交する水平線を指す。
レンズモデル(初期レンズ)LLは、フィッティングポイントPLを通る水平断面内においてフィッティングポイントPLにおけるレンズ凸面の法線Nが基準正面視線BLLと一致するように配置されている。フィッティングポイントPLを通る水平断面内において、法線Nと基準正面視線BLLとが一致する状態は、レンズフロント角のない状態であり(図4(a)参照)、法線Nと基準正面視線BLLとが一致しない状態は、レンズフロント角のある状態である(後述の図4(b)参照)。
また、符号AL、BL、CLは夫々、レンズモデル(初期レンズ)LLの装用時における左眼の視線を指す。符号ALe、BLe、CLeは夫々、視線AL、BL、CLのうちの像側視線を指す。像側視線は、眼球回旋中心OELからレンズモデルLLまでの視線部分を示す。符号ALo、BLo、CLoは夫々、視線AL、BL、CLのうちの物体側視線を指す。物体側視線は、レンズモデルLLから外側の視線部分を示す。図4(a)に示されるように、像側視線ALeは、像側視線BLeに対して左方向に角度θだけ傾斜し、像側視線CLeは、像側視線BLeに対して右方向に角度θだけ傾斜している。正面視時の像側視線BLeは、基準正面視線BLLと一致する。
眼球回旋中心OELを通る光線であって正面視方向を含む複数の光線がレンズモデル(初期レンズ)LLによって受けるプリズム作用を計算する。計算結果は、レンズモデル(初期レンズ)LLの各点におけるプリズム作用の値の分布を示す。以下、この分布を「初期分布」と記す。なお、本実施形態では、眼球回旋中心OELを基準に視線及び光線を定義しているが、別の実施形態では、正面視時の眼の入射瞳中心を基準に視線及び光線を定義してもよい。
フレームデータに基づいてレンズモデル(初期レンズ)LLに対してレンズフロント角を設定する。
眼球回旋中心OELを通る正面視方向の光線がレンズフロント角設定後のレンズモデル(初期レンズ)LLによって受けるプリズム作用を、眼球回旋中心OELを通る正面視方向の光線がレンズフロント角設定前のレンズモデル(初期レンズ)LLによって受けるプリズム作用に一致させる(又は近付ける)ようにレンズモデル(初期レンズ)LLを補正する。ここでは、レンズ凸面に対するレンズ凹面の向きを補正する。以下、この補正を「向き補正」と記し、向き補正後のレンズモデルLLを「レンズモデル(向き補正後)LL」と記す。
眼球回旋中心OELを通る正面視方向以外の一以上の光線がレンズモデル(向き補正後)LLによって受けるプリズム作用を計算する。計算結果は、レンズモデル(向き補正後)LLの各点におけるプリズム作用の値の分布を示す。以下、この分布を「補正後分布」と記す。
初期分布に対する補正後分布のプリズム作用のズレ量を計算する。
初期分布に対する補正後分布のプリズム作用のズレ量が許容範囲内か否か判定する。ズレ量が許容範囲内にない場合は〈処理8-1〉に進む。ズレ量が許容範囲内に収まる場合は〈処理8-2〉に進む。
ズレ量が低減するようにレンズモデル(向き補正後)LLの凹面形状を補正する。レンズモデル(向き補正後)LLの凹面形状を補正した後、処理は〈処理6〉に戻る。
レンズフロント角が設定された状態において眼球回旋中心OELと所定の屈折力測定位置とを通る視線上で眼に作用する光の屈折度数が処方値に一致するようにレンズモデルLLの凹面形状を補正する。これにより、レンズフロント角によるプリズム作用の左右差が軽減されたレンズモデルLL(以下、「レンズモデル(左右差軽減)LL」)が完成する。
図4(b)は、眼球モデルEL及びレンズモデル(左右差軽減)LLが配置された仮想光学モデルを示す。図4(b)中、符号AL’、BL’、CL’は夫々、レンズモデル(左右差軽減)LLの装用時における左眼の視線を指す。符号ALe’、BLe’、CLe’は夫々、視線AL’、BL’、CL’のうちの像側視線を指す。符号ALo’、BLo’、CLo’は夫々、視線AL’、BL’、CL’のうちの物体側視線を指す。符号θLFは、法線Nと基準正面視線BLLとがなす水平方向の角度であってレンズフロント角を指す。図4(b)に示されるように、レンズモデル(左右差軽減)LLは、フィッティングポイントPLが基準正面視線BLL上に位置すると共に、法線Nと基準正面視線BLLとがレンズフロント角θLFをなすように配置されている。
また、図4(b)に示されるように、正面視時の像側視線BLe’は、像側視線BLe(図4(a)参照)と同様に、基準正面視線BLLと一致する。像側視線ALe’は、像側視線ALe(図4(a)参照)と同様に、像側視線BLe’に対して左方向に角度θだけ傾斜し、像側視線CLe’は、像側視線CLe(図4(a)参照)と同様に、像側視線BLe’に対して右方向に角度θだけ傾斜している。物体側視線BLo’は、物体側視線BLo(図4(a)参照)に対して位置が異なるが、方向は一致している。
眼鏡レンズ設計用コンピュータ202は、図3の処理ステップS11(レンズフロント角によるプリズム作用の左右差の軽減)にて完成させたレンズモデル(左右差軽減)LLのプリズム作用の値の分布を計算する。以下、この分布を「左右差軽減後分布」と記す。
眼鏡レンズ設計用コンピュータ202は、ラップアラウンド型眼鏡を装用する装用者の眼が感じるプリズム作用を普段と同じ状態にするため、目標となるプリズム作用の値の分布を設定する。以下、この分布を「目標分布」と記す。ここでは、目標分布を設定する方法として、次の3例を挙げる。
眼鏡店スタッフは、眼鏡店10に設置されている計測器(不図示)を用いて装用者が日常装用している眼鏡レンズの形状(ベースカーブ等)を測定する。以下、装用者が日常装用している眼鏡レンズを「日常眼鏡レンズ」と記す。測定により採取されたベースカーブ等のデータは、店頭コンピュータ100に入力される。一般に、日常眼鏡レンズは、ラップアラウンド型眼鏡よりもベースカーブが浅い(いわゆるフラットなベースカーブを持つ)。店頭コンピュータ100は、測定データに基づいて装用者の日常眼鏡レンズのプリズム作用の値の分布を計算し、計算された分布をインターネット経由で眼鏡レンズ製造工場20に送信する。眼鏡レンズ設計用コンピュータ202は、ホストコンピュータ200を介して店頭コンピュータ100にて計算された日常眼鏡レンズのプリズム作用の値の分布を受信し、受信された分布を目標分布として設定する。なお、日常眼鏡レンズのベースカーブの値は、必ずしも計測器を用いて測定せずとも取得することができる。例として、日常眼鏡レンズのベースカーブの値は既知の場合がある。具体的には、カルテ等で装用者の日常眼鏡レンズの商品名が判っている場合、眼鏡店スタッフは、その商品のカタログ等の記載から日常眼鏡レンズのベースカーブの値を取得することができる。また、眼鏡店スタッフは、経験を活かし、日常眼鏡レンズのベースカーブの値を目視で決定し取得する場合もある。
本設定方法2は、装用者の日常眼鏡レンズの形状を実測できない場合に有用である。具体的には、眼鏡レンズ設計用コンピュータ202のメモリに、複数種類の目標分布が予め格納されている。複数種類の目標分布の各々は、夫々異なるサンプルレンズを装用した状態でのプリズム作用の値の分布である。サンプルレンズは日常眼鏡レンズを想定したレンズであり、いわゆるフラットなベースカーブを持つ。ここで想定される複数種類のサンプルレンズは、あらゆる装用者に対応するため、例えばベースカーブやレンズ径が夫々異なる。眼鏡レンズ設計用コンピュータ202は、レンズデータに基づいて複数種類のサンプルレンズ(目標分布)の中から装用者に最適なサンプルレンズ(目標分布)を選択して設定する。
上記の設定方法1及び2は、眼鏡レンズを日常的に装用している装用者をターゲットとした方法である。これに対して、本設定方法3は、普段裸眼の人に有用な方法である。具体的には、眼鏡レンズ設計用コンピュータ202は、裸眼の状態(すなわち、眼前におけるプリズム作用が全域に亘ってゼロの分布)を目標分布として設定する。
眼鏡レンズ設計用コンピュータ202は、図3の処理ステップS12にて計算された左右差軽減後分布と、図3の処理ステップS13(目標分布の設定)にて設定された目標分布とのズレ量を計算する。
眼鏡レンズ設計用コンピュータ202は、図3の処理ステップS14(ズレ量の計算)にて計算されたズレ量が所定の許容範囲内か否かを判定する。例えば、所定の各評価点におけるズレ量が全て所定の許容範囲内か否かが判定される。所定の許容範囲内に収まらない評価点が一点でも存在する場合は(図3のS15:NO)、図3の処理ステップS16(レンズ凹面形状の補正)に進む。全ての評価点が所定の許容範囲内に収まる場合は(図3のS15:YES)、図3の処理ステップS17(度数の補正)に進む。
眼鏡レンズ設計用コンピュータ202は、ズレ量を所定の許容範囲内に収めるため、レンズモデル(左右差軽減)LLの凹面形状を補正する。具体的には、眼球回旋中心OELを通る各視線方向の光線がレンズモデル(左右差軽減)LLによって受けるプリズム作用を、日常眼鏡レンズ又はサンプルレンズによって受けるプリズム作用(若しくはプリズム作用のない裸眼の状態)に一致させる(又は近付ける)ように凹面形状の補正が行われる。眼鏡レンズ設計用コンピュータ202は、凹面形状の補正後、図3の処理ステップS14(ズレ量の計算)に戻り、再度、図3の処理ステップS14(ズレ量の計算)及び処理ステップS15(ズレ量の判定)を行う。以下、本処理ステップS16にて凹面形状が補正されたレンズモデルLLを「レンズモデル(凹面形状補正後)LL」と記す。ズレ量は、図3の処理ステップS14(ズレ量の計算)から図3の処理ステップS16(レンズ凹面形状の補正)を繰り返すことにより、所定の許容範囲内に収まる値に収束する。
眼鏡レンズ設計用コンピュータ202は、眼球回旋中心OELと所定の屈折力測定位置とを通る視線上で眼に作用する光の屈折度数が処方値に一致するようにレンズモデル(凹面形状補正後)LLの凹面形状を補正する。これにより、装用者の眼が感じるプリズム作用が普段(例えば日常眼鏡レンズ又はサンプルレンズを装用した状態若しくは裸眼の状態)と一致又は近似するラップアラウンド型眼鏡が完成する。
本実施例1のレンズモデル(初期レンズ)LLは度付きであって、ベースカーブが深く、かつレンズフロント角(フレームのそり角)がゼロのレンズである。このようなレンズの一例として、ベースカーブが深く設計された度付きのサングラスが想定される。本実施例1における目標は、レンズモデル(初期レンズ)LLと同じ度数が処方されたレンズであって、レンズモデル(初期レンズ)LLよりもベースカーブが浅くかつレンズフロント角がゼロの日常眼鏡レンズである。ここで、「度付き」レンズとは、視力矯正を目的としたものであり、球面屈折力や乱視屈折力等が処方されたレンズを指す。
〈レンズモデル(初期レンズ)LL〉
BC :10.00 Diopter
S :+2.00 Diopter
CT :3.2mm
屈折率:1.6
〈目標レンズ(日常眼鏡レンズ)モデルLL〉
BC :4.00 Diopter
S :+2.00 Diopter
CT :3.2mm
屈折率:1.6
本実施例2のレンズモデル(初期レンズ)LLは度無しであって、ベースカーブが深く、かつレンズフロント角(フレームのそり角)がゼロのレンズである。このようなレンズの一例として、ベースカーブが深く設計された度無しサングラスが想定される。本実施例2における目標は、度数が処方されていないレンズであって、レンズモデル(初期レンズ)LLよりもベースカーブが浅くかつレンズフロント角がゼロの日常眼鏡レンズである。
〈レンズモデル(初期レンズ)LL〉
BC :10.00 Diopter
S :0.00 Diopter
CT :2.0mm
屈折率:1.6
〈目標レンズ(日常眼鏡レンズ)モデルLL〉
BC :4.00 Diopter
S :0.00 Diopter
CT :2.0mm
屈折率:1.6
本実施例3のレンズモデル(初期レンズ)LLは本実施例2と同一であり、具体的には、度無しであって、ベースカーブが深く、かつレンズフロント角(フレームのそり角)がゼロのレンズである。本実施例3における目標は裸眼である。すなわち、本実施例3では、実施例設計レンズを装用した際に眼が感じるプリズム作用を、裸眼の状態(すなわち、眼前におけるプリズム作用が全域に亘ってゼロの分布)に近似させる。
Claims (13)
- 眼鏡レンズの初期形状データを取得する初期形状データ取得手段と、
前記初期形状データに基づいて製作される初期レンズのベースカーブを第一のベースカーブと定義し、該第一のベースカーブより低い第二のベースカーブを持つ所定のレンズを指標眼鏡レンズと定義した場合に、光学設計上想定される眼の中心を通る各視線方向の光線が該初期レンズによって受けるプリズム作用を、該指標眼鏡レンズによって受けるプリズム作用に一致させる又は近付けるように、該初期形状データを補正する形状データ補正手段と、
補正された初期形状データに基づいて眼鏡レンズを製造する眼鏡レンズ製造手段と、
を備える、
レンズ供給システム。 - 前記眼鏡レンズの装用を予定する装用者が日常装用している眼鏡レンズを日常眼鏡レンズと定義した場合に、該日常眼鏡レンズの形状を測定する形状測定手段と、
前記測定の結果に基づいて前記日常眼鏡レンズの形状データを作成する日常眼鏡形状データ作成手段と、
を備え、
前記形状データ補正手段は、
光学設計上想定される前記眼の中心を通る各視線方向の光線が前記初期レンズによって受けるプリズム作用を、前記日常眼鏡レンズによって受けるプリズム作用に一致させる又は近付けるように、該日常眼鏡レンズの形状データに基づいて前記初期形状データを補正する、
請求項1に記載のレンズ供給システム。 - 前記形状測定手段により測定された前記日常眼鏡レンズのベースカーブの値を入力する入力手段
を備える、
請求項2に記載のレンズ供給システム。 - 所定の複数種類のサンプルレンズの中から1つのサンプルレンズを選択するサンプル選択手段
を備え、
前記形状データ補正手段は、
光学設計上想定される前記眼の中心を通る各視線方向の光線が前記初期レンズによって受けるプリズム作用を、前記サンプル選択手段にて選択されたサンプルレンズによって受けるプリズム作用に一致させる又は近付けるように、該サンプルレンズの形状データに基づいて前記初期形状データを補正する、
請求項1に記載のレンズ供給システム。 - 眼鏡レンズの初期形状データを取得する初期形状データ取得手段と、
光学設計上想定される眼の中心を通る各視線方向の光線が前記初期レンズによって受けるプリズム作用を、プリズム作用のない裸眼の状態に一致させる又は近付けるように、該初期形状データを補正する形状データ補正手段と、
を備える、
眼鏡レンズを供給するためのレンズ供給システム。 - 前記形状データ補正手段は、
前記光線が前記初期レンズによって受けるプリズム作用と、該光線が前記指標眼鏡レンズによって受けるプリズム作用とのズレ量を計算し、
計算されたズレ量が所定の許容範囲内に収まるように、前記初期レンズの凸面及び凹面の少なくとも一面を補正する、
請求項1から請求項4の何れか一項に記載のレンズ供給システム。 - 前記形状データ補正手段は、
前記光線が前記初期レンズによって受けるプリズム作用と、該光線がプリズム作用を受けない状態とのズレ量を計算し、
計算されたズレ量が所定の許容範囲内に収まるように、前記初期レンズの凸面及び凹面の少なくとも一面を補正する、
請求項5に記載のレンズ供給システム。 - 前記形状データ補正手段は、
レンズの周辺領域での前記ズレ量が所定の許容範囲内に収まるように、前記初期レンズの凸面及び凹面の少なくとも一面を補正する、
請求項6又は請求項7に記載のレンズ供給システム。 - 前記眼の中心は、眼球回旋中心又は正面視時の眼の入射瞳中心である、
請求項1から請求項8の何れか一項に記載のレンズ供給システム。 - 所定の初期形状データに基づいて製作される初期レンズのベースカーブを第一のベースカーブと定義し、該第一のベースカーブより低い第二のベースカーブを持つ所定のレンズを指標眼鏡レンズと定義した場合に、光学設計上想定される眼の中心を通る各視線方向の光線が該初期レンズによって受けるプリズム作用を、該指標眼鏡レンズによって受けるプリズム作用に一致させる又は近付けるように、該初期形状データを補正することにより得られる補正データ、に基づいて形成された形状を持つ、
眼鏡レンズ。 - 光学設計上想定される前記眼の中心を通る各視線方向の光線が前記初期レンズによって受けるプリズム作用を、前記眼鏡レンズの装用を予定する装用者が日常装用している日常眼鏡レンズによって受けるプリズム作用に一致させる又は近付けるように、前記初期形状データを補正することにより得られる補正データ、に基づいて形成された形状を持つ、
請求項10に記載の眼鏡レンズ。 - 光学設計上想定される眼の中心を通る各視線方向の光線が所定の初期形状データに基づいて製作される初期レンズによって受けるプリズム作用を、プリズム作用のない裸眼の状態に一致させる又は近付けるように、該初期形状データを補正することにより得られる補正データ、に基づいて形成された形状を持つ、
眼鏡レンズ。 - 眼鏡レンズの初期形状データを取得する初期形状データ取得工程と、
前記初期形状データに基づいて製作される初期レンズのベースカーブを第一のベースカーブと定義し、該第一のベースカーブより低い第二のベースカーブを持つ所定のレンズを指標眼鏡レンズと定義した場合に、光学設計上想定される眼の中心を通る各視線方向の光線が該初期レンズによって受けるプリズム作用を、該指標眼鏡レンズによって受けるプリズム作用に一致させる又は近付けるように、該初期形状データを補正する形状データ補正工程と、
補正された初期形状データに基づいて眼鏡レンズを製造する眼鏡レンズ製造工程と、
を含む、
眼鏡レンズの製造方法。
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JP2015505427A JPWO2014141985A1 (ja) | 2013-03-15 | 2014-03-06 | 眼鏡レンズ及びその製造方法並びにレンズ供給システム |
US14/777,136 US9753307B2 (en) | 2013-03-15 | 2014-03-06 | Spectacle lens, manufacturing method thereof and lens supply system |
AU2014231883A AU2014231883B2 (en) | 2013-03-15 | 2014-03-06 | Spectacle lens, manufacturing method thereof and lens supply system |
EP14763309.3A EP2975450A4 (en) | 2013-03-15 | 2014-03-06 | GLASS GLASS, PROCESS FOR PRODUCING THE SAME, AND OPTICAL GLASS DISPENSING SYSTEM |
CN201480016149.7A CN105074541B (zh) | 2013-03-15 | 2014-03-06 | 眼镜镜片及其制造方法以及镜片供给*** |
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WO2014141985A1 true WO2014141985A1 (ja) | 2014-09-18 |
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PCT/JP2014/055726 WO2014141985A1 (ja) | 2013-03-15 | 2014-03-06 | 眼鏡レンズ及びその製造方法並びにレンズ供給システム |
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US (1) | US9753307B2 (ja) |
EP (1) | EP2975450A4 (ja) |
JP (1) | JPWO2014141985A1 (ja) |
CN (1) | CN105074541B (ja) |
AU (1) | AU2014231883B2 (ja) |
WO (1) | WO2014141985A1 (ja) |
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JP2021531513A (ja) * | 2018-07-26 | 2021-11-18 | オークリー インコーポレイテッド | 改善された光学特性を有する、アイウェア及び他の頭部装着型支持手段のためのレンズ |
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CN108474837A (zh) | 2015-12-22 | 2018-08-31 | 皇家飞利浦有限公司 | 基于超声的跟踪 |
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JP2002511594A (ja) * | 1998-04-09 | 2002-04-16 | ナイキ・インコーポレーテッド | 偏心した保護性の眼の着用体 |
JP2008058576A (ja) * | 2006-08-31 | 2008-03-13 | Seiko Epson Corp | 眼鏡レンズの設計方法 |
WO2010104182A1 (ja) * | 2009-03-12 | 2010-09-16 | Hoya株式会社 | 眼鏡レンズの形状データ作成方法、眼鏡レンズの形状データ作成装置及び眼鏡レンズ |
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AUPO625797A0 (en) | 1997-04-17 | 1997-05-15 | Sola International Holdings Ltd | Spectacles bearing sunglass lenses |
US6009564A (en) | 1998-06-24 | 2000-01-04 | Oakley, Inc. | Optically corrected goggle |
DE102006030204A1 (de) | 2006-06-30 | 2008-01-03 | Rodenstock Gmbh | Brillenglaspaar bei Anisometropie |
EP2177943A1 (en) | 2008-10-16 | 2010-04-21 | Essilor International (Compagnie Générale D'Optique) | Optical system determination according to advanced criteria |
JP5187227B2 (ja) | 2009-02-23 | 2013-04-24 | セイコーエプソン株式会社 | 眼鏡レンズの設計方法 |
SG182631A1 (en) | 2010-01-22 | 2012-08-30 | Oakley Inc | Lenses for 3d eyewear |
-
2014
- 2014-03-06 EP EP14763309.3A patent/EP2975450A4/en not_active Withdrawn
- 2014-03-06 US US14/777,136 patent/US9753307B2/en active Active
- 2014-03-06 CN CN201480016149.7A patent/CN105074541B/zh active Active
- 2014-03-06 JP JP2015505427A patent/JPWO2014141985A1/ja active Pending
- 2014-03-06 WO PCT/JP2014/055726 patent/WO2014141985A1/ja active Application Filing
- 2014-03-06 AU AU2014231883A patent/AU2014231883B2/en active Active
Patent Citations (4)
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JP2002511594A (ja) * | 1998-04-09 | 2002-04-16 | ナイキ・インコーポレーテッド | 偏心した保護性の眼の着用体 |
JP2008058576A (ja) * | 2006-08-31 | 2008-03-13 | Seiko Epson Corp | 眼鏡レンズの設計方法 |
WO2010104182A1 (ja) * | 2009-03-12 | 2010-09-16 | Hoya株式会社 | 眼鏡レンズの形状データ作成方法、眼鏡レンズの形状データ作成装置及び眼鏡レンズ |
US20120008089A1 (en) | 2009-03-12 | 2012-01-12 | Hoya Corporation | Method of compiling shape data of a spectacle lens, spectacle lens shape data compiling device and spectacle lens |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2021531513A (ja) * | 2018-07-26 | 2021-11-18 | オークリー インコーポレイテッド | 改善された光学特性を有する、アイウェア及び他の頭部装着型支持手段のためのレンズ |
Also Published As
Publication number | Publication date |
---|---|
CN105074541A (zh) | 2015-11-18 |
US20160033791A1 (en) | 2016-02-04 |
EP2975450A1 (en) | 2016-01-20 |
CN105074541B (zh) | 2017-10-13 |
EP2975450A4 (en) | 2016-11-30 |
AU2014231883A1 (en) | 2015-10-15 |
US9753307B2 (en) | 2017-09-05 |
AU2014231883B2 (en) | 2017-06-01 |
JPWO2014141985A1 (ja) | 2017-02-16 |
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